Treating dry webs of woven material



Dec. 30, 1930. MALY TREATING DRY WEZBS OF WOVEN MATERIAL Filed May 2.1928 Patented Dec. 30, 1930 HERMANN IJIALY, GUBEN, GERMANY TREATING DRYWEBS OF WOVEN MATERIAL Application filed May 2, 1928, Serial No.274,582, and in Germany May 10, 1927.

The invention relates to a method of and a machine-for moistening,chemically treating, and steaming dry webs of woven material.

.In the dry, and particularly in the hot refinement or dressing of thewebs of woven material there has always been up to now the noxiousresult that the web becomes exceedingly dry. To compensate as far aspossible this noxious condition, the'known moistening processes havebeen employed hitherto, which consist either in artificially moisteningthe air,'or leading the exceedingly dry webs along moist surfaceswithouttouching the same,

1 or in sprinkling the web faces with finely atomized water, orinserting the dry webs between moistened cloths.

The two first-named processes sufier from the drawback, that afurtherdrying of the dry web, which is warmer than the surrounding air, takesplace until a state of equalization of temperature arises between thisdry and warmer web and the air. Only from this moment begins thehygroscopic action, and

this only 450 a degree corresponding to the moisture contained in theair.

The two last-named processes suffer from the well-known drawback thatprevious dressing effects, as e. g. pressing effects, are destroyed bythem, and that these processes therefore can be employed only withinnarrow limits.

Now my present invention relates on the one hand to a process formoistening, by a simultaneous capillary and hygroscopic action,exceedingly and normally dry webs, to such an extent, that thesubsequent dressing process up to the hot-pressing just consumes themoisture contained in the web, and, on the other hand, to a method andapparatus for applying Water or chemical agents to exceedingly ornormally dry webs, with slmultaneous capillary, hygroscopic, and osmoticaction, without moistening the web to such an extent, that a specialsubsequent drying operation is required.

To carry out my new process, I employ a machine as illustrated in thedrawing, that accompanies and forms part of this speclfi- 50 cation.

The figure shows a front view of the machine.

The machine illustrated possesses two rollers 'w w that alternately actas magazine and receiving rollers. The rollers '20 and w are drivenrespectively by drive shafts b and 6 First the wrapping cloth Z is woundon roller 10 from roller 4,0 and then it is wound on roller 10 fromroller 'w The rollers Q01, 10 are designed as perforated metallic hollowrollers. The wrapping cloth Z receives its driving motion from a pair ofpressure rollers (Z d The motion of the wrapping cloth is constant; thatof the winding rollers w 10 is accomplished by a leading friction drive.Besides imparting motion, the pair of pressure rollers 6Z1, (Z serves atthe same time to evenly distribute the moisture taken up by the wrappingcloth. The degree of moisture of the wrapping cloth may be regulated byvarying the speed of rotation of the moistening roller a.

' The machine is further provided with a suction or pressure pump 79,which is connected through pipes 0 c with the perforated hollow rollerse0 w. The latter may also be connected to a steam supply.

The process the described machine is intended for, takes place in thefollowing manner:

The dry webs m, y are Wrapped into the wrapping cloth Z that ismoistened with water or a suitable solution. During or after thewrapping procedure the air pump 29 is started. An equalization of themoisture contained in excess in the wrapping cloth Z then takes .placebetween the latter and the dry webs as,

y. This equalization takes place both through capillary action, as thetwo dry surfaces of each of the webs :0, y are in close contact with themoist surfaces of the wrapping cloth Z, and through hygroscopic action,as the air current set up by the air pump 32 as suction or pressurecurrent, is forced to first pass through themoist layers of the wrappingcloth Z, before passing through the layers of the dry webs m, y. The aircurrent cools down on passing the moist wrapping cloth and be comessaturated with moisture, and the dry web, that is hotter than the moistcloth, is

likewise cooled down, and this more quickly.

Hence, the moist air robs the hotter dry web of the high insulatingcapacity it possesses due to its high dry heat, whereby the equalizationof moisture and heat between the moist cool wrapping cloth and thehotdry web is particularly facilitated.

The described process also affords the peculiar effect, that, even whenemployed a shortened manner, that is, when less moisture is to beapplied to the web than corresponds to the coeflicient of equalizationbetween the wrapping cloth and the web, this smalleramount of moistureis apknown dry steaming pressure steam is used.

producedfrom the moisture in the roll itself isused for steaming thematerial, while 1n contradlstmctlon thereto, m the hitherto process,fresh high After steaming. the web, the surplus moistureis drawn offinfthe form of steam by the air pump p, until a suitable cooled state ihas been reached,- by the air pump p. r

Due to the hitherto known dry steaming process operating with highpressure steam,

the web was exceedingly dried and overheated. This noxious effectcannot'arise with. my hereinbefore described process, as the moisturemtroduced'm the roll, 1s evaporated, whereby the webv is protected frombecoming exceedingly dry and. overheated.

This is an important advantage that is afforded by my process. What Iclaim, is':'

1. The-process of treating dry webs of woven material consisting inmoistening a wrapping cloth, forming the cloth and web into a roll inalternate layers, and leading a gaseous agent through the roll touniformly transmit the moisture in the cloth to theweb. f

2. The process of treating dry webs of woven material consisting inmoistening a wrapping cloth, forming the cloth and web into a roll inalternate layers, and leading steam through the roll to uniformlytransmit the moisture in the cloth to the web.

4 3. The process of treating hot dry webs ofwoven material consisting inmoistening a wrapping cloth, forming the cloth and web into afroll inalternate layers, and leading a gaseous agent through the rolltouniformly transmit the moisture in the cloth to the web.

'4. The combination for treating dry webs of, woven material of aperforated hollow roller, a wrapping cloth, means for winding said dryweb accompanied by said wrapping cloth on said roller, means formoistening said wrapping. cloth prior to its being wound with said dryweb on said roller,

and means for sending a gaseous agent through said roller, wrappingcloth, and woven web. 7 p I v i 5. The combination for treating dry websof woven material of a perforated hollow roller, a wrapping cloth, meansfor winding said dry web accompanied by said wrapping cloth onssaidroller, means for moistening said wrapping cloth prior to its beingwound with said dry web on said roller,and

means for sending steam through said roller, wrapping cloth, and wovenweb.

G. The combination for treating of woven material of a perforated hollowroller, alwrapping cloth, means for winding said-dry web accompanied bysaid wrapping cloth on said roller, means for moisteningsaid wrappingcloth, prior to its being wound withsald dry'web on said roller, meansfor regulating the amount of moisture taken up by'said wrapping cloth,

and means forl sending a gaseous agent dry webs through said roller,wrapping cloth, and

woven web.

HERMANN MALY.

EMU

